Obsolescence of heaven? [updated]

Adam Ozimek at the excellent Modeled Behavior (despite its inferior spelling of the latter term) ponders what happens for Christians when science makes death near-obsolete. If you have to die to get to heaven, and if your religion forbids suicide and requires you to take lifesaving medical treatments, what happens? He gives some options, none of which I find terribly plausible:

• A rise in religious suicide bombing, sending souls to heaven targeted at scientists bringing forth the singularity
• Decline in religious observance - rise in atheism
• Rise in religions prohibiting life-saving treatments

None of these strike me as plausible [updated]. Instead, I'd predict a shift towards millennialist versions of Christianity in which folks immortally await the Rapture. Why? Because that's the lowest belief-cost move for Christians. Suicide terrorism - high cost and doesn't square well with most folks' existing beliefs. Rise in atheism - high cost of changing beliefs. Rise in religions prohibiting treatment - high real-life cost of belief.

But switching slightly towards predictions of the Rapture - that's low real-life cost, and relatively low belief cost. Just model folks, as Caplan does, as optimizing over the psychic cost of diverging from a bliss belief and the real-world cost of holding any beliefs, and the comparative statics on this one seem pretty obvious.

Update: LemmusLemmus makes the obvious point on cohort changes over time leading to more atheism: he's certainly right. Fewer will opt into religion when fear of death is gone. And Adam notes that terrorism targeted at the scientists bringing forth life extension is plausible. I'd agree - there could be a few folks nuts enough to do it.